2 Suggested Answers

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I have an identical situation. I have isolated the source of the loud
screech to the (laser scanner assembly) p/n RGO-1041. The unit is
located underneath the top cover, where the printed paper rests after
it is ejected. I had to remove the right and left side covers, then
remove the three screws holding down the top cover. There are two
screws up front and one to the rear, it then lifts straight up. The
laser scanner has a ribbon cable, and four purple wires going to it, oh
yeah there is a big yellow warning label, so you can't miss it. I hope
this helps. Sorry, I accidentally posted this in problem section.

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Screeching noises usually mean a bearing is seized or about to seize. The fact it stalls and won't start indicates its more likely an oil pressure issue, since many car computers will shut the engine down to protect it from damage, if a low or no oil pressure condition is detected. You need to take it in ASAP and have it checked so any damage is kept to a minimum.

You may need to lubricate the moving parts. I had a printer that was playing up like this and the bars that the print head moved on needed a tissue with a small quantity of machine oil to be rubbed on the bar to allow the print head to move freely. If all the scanners are the same age the lubrication they had may have worn off.

the smell could be oil leaking on to the exhaust from the rocker covers.(common problem in Subaru because of the side mounted pistons. Engine stop oil leak might fix other wise will have to get tappet cover seals replaced as they crack over time from the heat) easy enough fix. a tell tale sign is signs of engine oil stains or signs of oil dripping on to the exhaust(can locate by looking under the front of the car at the bottom of the engine itself) and this is probably the cause of the engine knock due to low oil.it will continue to leak till the problem is fixed

Knocking means you're still low on oil. Try have an oil and filter change. If your engine is blown, you won't hear or feel it cause it's seized. A dying engine from oil starvation would make screeching metal to metal noise. Yours sounds more like a stuck cam follower from oil starvation.

right click on the speaker icon in your taskbar, select Open Volume Control. If you do not see the Microphone control select options>properties and select it from the list of check boxes. Press OK. Check the mute box for your microphone.